\input zb-basic
\input zb-matheduc
\iteman{ZMATH 2015b.00011}
\itemau{Krech, Ireneusz}
\itemti{On rotations of geometrical.}
\itemso{Obz. mat. fyz. inform. 43, No. 3, 21-24 (2014).}
\itemab
Summary: The paper presents some original solutions to a certain problem on rolling coins (circles) derived from a book by {\it D. G. Wells} [The Penguin book of curious and interesting puzzles. New York, NY: Penguin Books (1992; Zbl 0925.00013)], and also proposes several generalizations of the problem.
\itemrv{~}
\itemcc{A20 A80}
\itemut{mathematical problems; puzzles; circles}
\itemli{}
\end